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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fddc746c1886143d110fc1b29cbe81986cbd27e0299e10917e4da96befb3942' 
  AND token = 'vdiPG69iGfGE6IAl58UnBYabqYlm7ElVC0G5Cz7jrxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}